{"type":"rich","version":"1.0","author_name":"Tobias Denkinger (npub1sr…hf9qm)","author_url":"https://nostr.ae/npub1srxyarmjhgdsppa8eqhtxjmnm9cuw2yc4nvaf0zs7lduut42grmsfhf9qm","provider_name":"njump","provider_url":"https://nostr.ae","html":"I am probably missing the point here, but you cannot really convert between mph and min/mile.  The first one is a unit of [speed] = [distance] / [time] and the second one is a unit of [time] / [distance].  (You swapped NGP and FTP in the last equation, so the end result is fine.)"}